Gaurav Khanna, a Professor of Physics at the University of Massachusetts Dartmouth, argues that rotating black holes could potentially be used as portals for hyperspace travel. I know what you are thinking, but Khanna argues that "not all blackholes are created equally" and some are "weak" enough that the singularity would not cause any damage to objects that interact with it.
My team at the University of Massachusetts Dartmouth and a colleague at Georgia Gwinnett College have shown that all black holes are not created equal. If the black hole like Sagittarius A*, located at the center of our own galaxy, is large and rotating, then the outlook for a spacecraft changes dramatically. That’s because the singularity that a spacecraft would have to contend with is very gentle and could allow for a very peaceful passage.
The reason that this is possible is that the relevant singularity inside a rotating black hole is technically “weak,” and thus does not damage objects that interact with it. At first, this fact may seem counter intuitive. But one can think of it as analogous to the common experience of quickly passing one’s finger through a candle’s near 2,000-degree flame, without getting burned.
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